Machine for stitching covers on cores



Apr. 17, 1923. 11,451,962

. P. RISSMANN MACHINE FOR STITCHTNG COVERS ON CORES Filed July 11, 1921 4 Sheets-Sheet 1 INVENTOR.

A TTORNEY.

Apr. 17, 1923. mswaz P. RISSMANN MACHINE FOR SIITCHING COVERS ON CORES Filed July 11. 1921 4 Sheets-Sheet INVENTOR.

ATTORNEY.

P. RISSMANN MACHINE FOR STITGHING COVERS ON CORES Filed July 11, 1921 4 Shee t s -Shee t B INVENTOR.

A TTORNEY.

' Patented Apr. 17, 1923.

teaser PAUL mssmann, OF J DETLBbIT, MICHIGAN, assrenon mo FISHER BODY coarona'rron,

ornn'morr, MICHIGAN, A CORPORATION OF NEW YORK.

m acnmn FOR s'rI'romne-covnns on oonns.

Application area July 11, 1921. Serial no. 483,787.

To all whom it may concern:

Be it known that I, PAUL RIssMaNN, a citizen of the United States, residin at Detroit, in the county of Wayne and tate 5 of Michigan, have invented certain new a'nd useful Improvements in Machines for Stitching Covers on Cores, of'w'h'ich the following is a specification. a

This invention :relates to machlnes for sewing the trimming material on a core. It isespecially adapted for sewing trlmming material on a robe rail, solid or flexible.

In rior application, Serial No. 418,208, filed ctober 20, 1920, I have described in detail a machine for whip-stitching two edges of trimming material together to cover a flexible cord or robe rail. The. present invention is an improvement on this machine.

The machine by virtue of the special feeding devices is arranged to feed a metal rod covered with trimming material to the needle. This permits the machine to handle trimming of so called solid robe rails, which is not possible on the other construction.

In the drawings,-

Fig. 1 is a plan view of the machine.

Fig. 2 is an end elevation.

Fig. 3 is a side elevation.

Fig. is a cross section taken on the line 44 of Fig. 1.

Fig. 5 is a section taken on the line 55 of Fig. l.

Fig. 6 is a section taken on the hue 6-6 of Fig. l.

Fig. 7 is a section taken on the line 7-7 of Fig. l.

l1 ig. 8 is a section taken on the line 8-8 of Fig. 1. 4- Fig. 9 is a section showing the completed robe rail.

a designates a machine housing which contains the operating mechanism for a whipstitch or overcast-stitch sewing machine. This sewing machine is part of the prior art and no claim is made to the specific construction ot' the actuating parts of the sewing machine. Hence the same are not illustrated in detail. A looper b is operated by suitable mechanism in the housing a, to hook under a thread 0 (Fig. 4) and carry the loop to the opposite side of the seam, while the needle Ll is drawn back out of the material and is again pierced through the material and through the newly formed loop. The looper then drops the loop and passes around to the right hand side of .the seam and again picks up the thread a from the needle and carries 1t to the opposite side of the seam to present another loop to be passed through.

by the needle. This operation forms a line of whip-stitches.

The intermittent feeding of the work forward is accomplished by a pair of rolls e and which have concaved and knurled or roug enedperipheries at the top. The roll f is pinned to a drive shaft 9. The roll 6 is rotatably supported upon the bushing 70 which engages around the stud m that screws into the arm n. This arm n is supported upon a sliding rod 5 which is slidable in and out of the housing a. The rod 5 passes through a sleeve 6 in the end of the arm n and the outer end of the rod is cut away to fit against the arm and be secured thereto by the screw 7.

Both of the lateral rolls f and e are positively driven. Pinned to the under side of the roll f is a bevel gear k which engages with the bevel pinion 0 secured to the under feed wheel section p. This under feed wheel is a two-part wheel provided with the feed wheel section p and the feed wheel section r. The under roll is supported upon the shaft 8 held in the bearings 9 secured to the head 119 provided with a stud-like depending portion 11 which can he adjustably raised and lowered in theloracltet 12 when: the screw 13 "is loosened. This bracket is supported upon the rod 5 and clamped thereto by the screws 1%. These two sections are slidable toward and away from each other upon the pins g. The' coil spring 3 tends to cause the two sections to separate for a purpose to be described. A bevel pinion as is secured to the right hand teed wheel section 1" and this meshw with the bevel gear y secured to the under side of the lateral feed wheele. The consequence is that all these thr e -feed wheels are positively driven and the under -feed Wheel is capable of expanding and contracting to accommodate itself to work of varying diameters and securely engage the trimming material 5 and the rail a in conjunction with the lateral feed rollers. The slide rod 5 carries, as already explained, the arm it, also the outside :feed roll 6 which is supported upon the arm it. As already explained, the bracket 12 is carried on the sliding rod- 5 and this bracket 12 supports theunder roll shaft 8.

This sliding rod has a flattened portion in which engages the fork 16 that is secured to varying diameters the shaft 17 mounted to turn in the walls of the housing a. Around this shaft is' coiled a strong torsional spring 18, one end of which is fastened to the'housing and the other end to the shaft. This torsional spring tends to keep the sliding rod 5 drawninto the housing and consequently holds the lateral feed roll 6 securely against the work with a spring pressure. The under feed roll section r is provided with a shoulder 19 adapted to be engaged by the lower portion of the outer lateral feed roll 6, while the other under roll section [I is provided with a shoulder 20 adapted to'be engaged by the lower portion of the stationary roll Inasmuch as these two under roll sections p and r are movable to ward and from each other, it will be obvious that the torsional spring that tends to force the outer lateral feed roll against the work also tends to constri'ct the two sections of the under roll together to cause them to grip the work. I

The spreading spring 8 for the two sections of the under rolls is very much weaker than the strong torsional spring. The function of this spreading spring 8 is to spread the rolls when the operator grasps the lateral roll 6 and pulls it out to release it from the work. Thereupon the under roll sections automatically spread themselves to release the work.

This arrangement of a two section or split under feed roll is not only important in providing a suitable grip and support for the under side of the work as it is run by the needle, but it also permits the machine to handle work of somewhat varying diameter which would not be otherwise possible without changing the character of the rolls. The lateral rolls have only their upper peripheral portions knurled and in contact with the work. Inasmuch as one of them is yieldingly displaceable with respect to the other, obviously these can accommodate themselves to work of varying diameters within given'limits. Inasmuch as the lower rolls are separable within given hunts against the yielding stress of the strong torsional spring, these gripping members also can accommodate themselves to work of within given limits. Furthermore. the lower roll may be adjusted to accommodate itself to the work for the lower roll is supported on the shaft 8 carried in the bearing plates 9 secured to the head 10, which is adjustable in the bracket 12 by loosening the screw 13.

The work is fed to the sewing mechanism bv the sheet metal trimming guide 3. which will be best understood by comparing the sections 5 to 9 inclusive. This sheet metal 2' ide 3 takes the trimming material t in its t condition, turns up the edges as shown abutting folded-in edges, as is plainly shown 7 in Fig. 4. The looper pulls the thread out of the needle after it has pierced the work and casts it over tothe opposite side of the seam. The needle is then pulled out of the work and the three positively driven feed rolls feed both the trimming material and solid core forward. Thereupon the needle again pierces the work and the loop held across the seam by the looper. The looper returns to the opposite side of the seam to pick up another loop of thread from the needle that has already pierced it, and so the operation goes on. i

The core guide 2 and the trimming guide 3 are supported upon the angle plates 22 which are secured to the angle casting 24 that is secured to the end of the arm n by the screws 23. The consequence is that the trimming guide and the core guide, the outer lateral roll 6. and the divided under roll are all carried on a sliding support provided with strong spring means that tends to force the outer lateral roll against the work and tends to force. the parts of the divided under roll together. plain surface of the lower peripheral portion of the lateral rolls co-operates with the shoulders on the divided under roll sections and forces these under roll sections evenly upon the work. This affords a feeding arrangement which is indeed highly efiicient to handle this nature of work for obviously were not the trimming material and the solid core gripped almost entirely around its cross section by gripping devices having a strong pressure, the trimming would creep on the smooth core inside and consequently the machine would be impossible. Furthermore. these three feedingrolls are located directly under the needle where they function to hold the trimming material as it comes from the guide in the desired relation to the solid core inside so that the needle can stitch the parts together when they are in their proner relation.

lVhat I claim is:

- 1. In a machine of the character specified. the combination of means for stitching. means for guiding and curling trimming material into a substantial tube. means for guiding a core within said trimming material tube, and a pair of lateral feed rolls The and an under feed roll all concaved and fitting closely together for substantially surrounding and feeding the combined core and trimming tube pastthe stitching means.

2. In a machine of the character specified, the combination of stitching means, a pair of lateral concaved' feed rolls for engaging a core and trimming material thereabout adjacent the stitching means, a. concaved under feed roll for engaging the said core and trimmin material, said concaved feed rolls all fitting closely together, and substantially surrounding the core for guiding a core to the stitching means, means for guiding and wrapping trimming material about the core, and means for yieldingly pressing the teed rolls'ii'pon the work.

3. In a machine of'the character specified, the combination of' stitching means, a pair of lateral feed rolls adjacent said stitching means arranged to engage the trimming material wrapped about a core, an underfeed roll directly under the core and trimming material and the lateral feed rolls, said feed roll and the two lateral feed rolls being all closely fitted together large portion of the circumference of the core and being all connected together in driving relation, means for guiding the core to the feed rolls and the stitching means, and means for iding and wrapping a trimming materia about the core.

4. In a machine of the character specified, the combination of stitching means, a pair of lateral feed rolls with concaved peripheries for engaging the sides of trimmlng material wrapped about a core, a two part under feed roll in which the parts are yieldingly urged together supported under the trimming material and core, means for guiding the core to the feed rolls and the stitching means, and means for guiding the trimming material and wrapping the same about the core.

5. In a machine of the character specified, the combination of stitching means, a pair of lateral feed rolls for engaging the sides of the trimming material and the core, a two-part under feed roll comprising a pair of roll sectiops in sliding but keyed-together arrangement, means for yieldingly urging them toward eaclrother and upon the trimming material and core, gear connections between the two lateral feed rolls and the under feed roll whereby all three feed rolls may be positively driven, means for guiding a core to the feed rolls and the stitching mechanism. and means for wrapping trim-' ming material about the core.

6. Iln a machine'of the character specified, the combination of stitching means provided with a needle, a pair of lateral feed rolls located under the needle, a two-part under feed roll located under the needle and the lateral rolls, means for yieldingly to engage about a.

separating the parts of the under feed roll, a second but stronger means for urging'the parts of the under feed roll together, means for guiding a core to the feed rolls and the 'a core covered with trimming material to the stitching means, means for guiding the core to the feed rolls and the stitching means, and means for guiding trimming material and wrapping it around such core as the same travels to the feed rolls and the stitching means.

8, In a machine of the character specified, the combination of stitching means, a pair of lateral feed rolls one of which is fixed and the other yieldingly pressed toward the first.

mentioned one, an under feed roll located between the two lateral feed rolls and pressed upon the work by the yieldingly pressed lateral feed roll, said rolls being ar ranged to feed a core covered with trimming material to the stitching means, means for guiding the core to the feed rolls and the stitching means, and means for guiding trimming material and wrapping it about the core as the same is guided to the feed rolls and the stitching means.

9. In a machine of the character specified. the combination of stitching means,a pair of lateral feed rolls one of which is yieldingly pressed upon the work, a divided under feed roll, the parts of which are yieldingly pressed together by engagement with the yieldingly pressed lateral feed roll, the said feed rolls being arranged to engage a core with trimming material thereupon and feed the same to the stitching means, means for guiding the core to the feed rolls and the stitching means, and'means for guiding trimming material and wrapping the same about the core.

10. In a machine of the character speci tied, the combination of stitching means provided with a needle a pair of lateral feed rolls directly below the stitching needle, one of which is yieldingly pressed toward the other, a divided under feed roll directly under the needle and the lateral feed rolls, said lateral feed rolls co-operating with the under feed roll to yieldingly press the parts of the under feed roll toward each other and upon the work, the said teed rolls being arranged to engage a core wrapped with trimming material, means for guiding the core to the feed rolls and the stitching means, and means for guiding and wrapping trimming material on the core.

11. In a machine of the character speci-' tied, the combination of stitching fneans, a pair of lateral feed rolls with the upper portions of their' peripheries concaved and roughened and the lower portions of their peripheries plain, an under feed roll having a pair of sections slidingly arranged with respect to each other having concaved peripheries and surfaces engaging the plain lower peripheral portions of the lateral feed rolls, means for yieldingly forcing the lateral feed rolls toward each other and thereby yieldingly forcing the sections of the under feed roll toward each other and upon the work, means for guiding a core to the feed rolls and the stitching means, and means for guiding trimming, material and wrapping the same about the core.

12. In a machine of the character specified, the combination of stitching means including a needle, a pair of lateral feed rolls located under the needle, one of which is yieldingly pressed toward the other, an under feed roll between the lateral feed rolls comprising a pair of sections having concaved peripheries and slidable with respect to each other, the said sections adapted to be engaged by the lateral feed rolls to press the same togetheiza spring between the sections for opening the sections when the pressure of the lateral feed roll upon the sections is relieved, means for guiding a core to the atinas feed rolls and the needle, and means for guiding trimming material and wrapping the same about the core.

13. In a machine of the character specified, the combination of stitching means, a pair of lateral feed rolls one of which is stationary and the other yieldingly pressed toward the stationary feed roll, a divided under feed roll in which the parts are pressed together by contact with the yieldingly pressed lateral feed roll and with the stationary feed roll, means for guiding the trimming material and the core to the feed rolls and the stitching: means, said guiding means being united with the movable lateral feed roll so as to move therewith. V

14. In a machine of the character specified, the combination of stitching means, a pair of lateral feed rolls, one or" which is stationary and the other yieldingly pressed toward the stationary feed roll, an under feed ro l in two sections which slide but are keyed together located directly under the lateral feed rolls and contacting the same, gear connections between the under feed roll sections and the lateral feed rolls so that all are positively driven to ether, and means for guiding a core and trimming material to the feed- IIL'Z roll and stitching mechanism.

In testimony whereof I aiiix my signature.

PAUL RISSMANN. 

